Explain by an experiment that air (oxygen) is necessary for combustion.
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Experimental Set-up:
candle in open space
candle but covered by inverted container
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You will find that the candle left in open space will continue burning while the candle covered will eventually die out. This shows that combustion uses air as the candle in open space is in contact with air, which is why it is still able to burn.
candle in open space
candle but covered by inverted container
—
You will find that the candle left in open space will continue burning while the candle covered will eventually die out. This shows that combustion uses air as the candle in open space is in contact with air, which is why it is still able to burn.
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Aim:
To show that oxygen (air) is necessary for combustion.
Materials Required:
Two candles, a match box and a glass jar. Theory Combustion is a chemical reaction in which a combustible substance burns in air (oxygen) to produce Carbon dioxide , water and heat.
Combustible substance (Fuel) + 0,— CO, + Water + Heat
Procedure:
(i) Light two candles and fix them on the table.
(ii) Cover one of the candles by an inverted glass jar.
Observations:
Candle covered by glass jar extinguishes due to the absence of air while the other candle keeps on burning because it is getting regular supply of oxygen (air). Conclusion Oxygen (air) is necessary for the combustion process.
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